since 2000
All about C1S Files
The C1S file type is primarily associated with Capture One.
What is a C1S file?
C1S files mostly belong to Capture One by Phase One. Capture One 4 is RAW workflow software. The software provides a step-by-step workflow through the image optimization process, allowing you to work with large volumes of images. The Capture One application creates a cache folder under its PhaseONE software folder under Program Files, but seems to store all its C1S files in the My Documents folder. You can change this using the program Preferences. After opening several folders of RAW photos, you can end up with 64K+ C1S files which may take a long time to open. There is a setting that is supposed to delete the cache when the application closes (one user reports this did not work for them).
How to open a C1S file
You need a suitable software like Capture One to open a C1S file. You need a suitable software like Capture One from Phase One to open a C1S file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your C1S file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a C1S file directly in the browser:. Just drag the file onto this browser window and drop it.
Online C1S Text Viewer
or drag and drop it here
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.C1S File Not Opening? How to Fix It:
Because .C1S files come from different programs, they aren't universally openable.
- Identify the Source: If received from a photographer or a studio workflow, it's likely a Capture One Photo Cache File.
- Check the Header: Inspect the first bytes in a text editor or hex viewer:
- Readable XML/JSON suggests a settings file.
- "SQLite format 3" indicates a database cache.
- Unreadable symbols imply a proprietary binary format.
- Use the Original Software: The original program is usually required. Try Phase One's Capture One, a compatible graphic viewer, or ask the sender if uncertain.
- Use this Webpage: Drag and drop the file into our viewer to detect the format, extract readable text or metadata, and preview when possible.
Technical Data for C1S File Extension
a c1s Photo Cache File is a special file format by Phase One and should only be edited and saved with the appropriate software.
How to solve problems with C1S files
- Associate the C1S file extension with the correct application.
- Update your software that should actually open photo cache files. Because only the current version supports the latest C1S file format. Search, therefore, e.g. on the Phase One manufacturer website after an available Capture One update.
- To make sure that your C1S file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
- Click here to open your .C1S file online - secure, fast, and no downloads needed.